Sanyo CE28DF1-C, Service Manual

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B1 POWER SUPPLY ADJUSTMENT
1. Set VR351 to be mechanical centre before pressing the main
switch.
2. Tune the receiver to PAL circular pattern.
3. Set brightness and contrast controls to normal.
4. Connect digital V-meter to test point "TP-B".
5. By using VR351, adjust voltage to 150 ± 0.5 V.
AFT ADJUSTMENT
1. B/G/I area : Tune the receiver to the clearest station on
system BG. By using T121, adjust AFT to obtain the best
picture.
2. L/L’ area : Tune the receiver to VL station on system L/L’. By
using VC141, adjust AFT to obtain the best picture.
3. If BG/I and L/L’ can be received adjust 1 and 2.
AGC ADJUSTMENT
NOTE: Do not attempt this adjustment with weak signal.
1. Tune the receiver to the clearest station.
2. Set AGC VR(VR120) in direction which causes snow noise
to appear, then in the opposite direction until snow noise just
disappears.
GREY SCALE ADJUSTMENT
[SCREEN VR ADJUSTMENT]
1. Tune the receiver to the white pattern.
2. Set brightness control to display centre and contrast control
to normal.
3. Set SW220 to "SERVICE" position.
4. Set VR602 and VR612 to be mechanical centre.
5. Turn VR601, VR611 and VR621 fully counter-clockwise.
6. Set screen VR for one colour to be just visible.
[BIAS VR ADJUSTMENT]
7. By using VR601, VR611 or VR621, adjust line to be white.
8. Set SW220 to "NORMAL" position.
[DRIVE VR ADJUSTMENT]
9. By using VR602 and VR612, adjust white balance.
HIGH VOLTAGE & WIDTH ADJUSTMENT
[HIGH VOLTAGE ADJUSTMENT]
1. Tune the receiver to PAL circular pattern.
2. Set brightness and contrast controls to maximum.
3. Connect digital V-meter to both terminals of R232(left
side)(+) , and high voltage meter to CRT anode.
4. Confirm high voltage to be 26.0 ± 1 KV at beam current 1.3,
and less than 29.0 KV at 0 beam current .
[H-WIDTH ADJUSTMENT]
5. Adjust VR462 to obtain proper H- width.
6. Reconfirm high voltage.
H-CENTRE ADJUSTMENT
1. Tune the receiver to circular pattern.
2. Adjust H-centre by using VR401.
V-CENTRE ADJUSTMENT
1. Tune the receiver to circular pattern.
2. Adjust V-centre by using SW451.
V-SIZE ADJUSTMENT
1. Tune the receiver to circular pattern.
2. Adjust V-size by using VR451.
FOCUS ADJUSTMENT
By using FOCUS VR, adjust focus control for well scanning
lines.